GM President of North America, Mr Mark Reuss, will select the new candidates while additionally creating a divisional reporting structure that separates sales and marketing roles on a brand-by-brand basis.
Chevrolet, Cadillac and Buick-GMC will each have a new marketing boss, and a new sales leader. The division chiefs now handle both functions.
The shakeup comes as Chairman and CEO, Mr Ed Whitacre, seeks to improve lagging sales and to rebuild consumer confidence. When he became chief executive in December, Mr Whitacre said his sales and marketing team would need to show results quickly.
The move will heap even more responsibility on Mr Reuss, 46, whom Whitacre promoted to his current position in December. Before that, Mr Reuss briefly headed GM engineering and was chief of GM's Australian unit, Holden.